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Northwest Africa 6077
Basic information Name: Northwest Africa 6077
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6077
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass:help 1010 g
Meteoritical Bulletin:  MB 99  (2011)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 155 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 26 May 2011
Writeup from MB 99:

Northwest Africa 6077 (NWA 6077)

(Northwest Africa)

Purchased: Sept 2008

Classification: Ungrouped achondrite

History: Purchased September 2008 by John Higgins from a Moroccan dealer in Agadir.

Physical characteristics: A single brownish 1010 g stone.

Petrography: (A. Irving and S. Kuehner, UWS) An olivine-rich assemblage with protogranular (possibly cumulate) texture exhibiting triple-junction grain boundaries. Additional minerals include orthopyroxene, clinopyroxene, altered kamacite, chromite, chlorapatite, Ni-bearing troilite and/or pyrrhotite. No plagioclase was found.

Geochemistry: Olivine (Fa30.2-30.7), orthopyroxene (Fs24.1-24.5Wo2.1-2.0), clinopyroxene (Fs9.4-10.0Wo44.0-43.5). Oxygen isotopes (D. Rumble, CIW): δ17O 2.667, 2.932; δ18O 5.180, 5.536; Δ17O -0.057, +0.020 per mil

Classification: Achondrite (ungrouped, brachinite-like). Specimen exhibits similar mineralogy and oxygen isotopic composition to NWA 5400, and is likely paired with it.

Specimens: A total of 26.8 g and one polished thin section are on deposit at UWS. The main mass is held by Mr. John Higgins.

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P Sept 2008
Mass (g):1010
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):30.2-30.7
Ferrosilite (mol%):24.1-24.5; 9.4-10.0
Wollastonite (mol%):2.1-2.0; 44.0-43.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):26.8
Type spec location:UWS
Main mass:J. Higgins
Comments:Submitted by A. Irving
Plots: O isotopes:  
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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     This is 1 of 9776 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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